CVE-2026-98077

netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace()

Published Sep 25, 2026 CVSS n/a EPSS < 1% KEV · Not listed

Description

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace()

sip_skip_whitespace() returns dptr unchanged when its own loop
exhausts the buffer (dptr == limit), instead of NULL like its sibling
sip_follow_continuation() returns on its own "no more data" path.

ct_sip_get_header() only checks for NULL after calling it:

dptr = sip_skip_whitespace(dptr, limit);
if (dptr == NULL)
break;
if (*dptr != ':' || ++dptr >= limit)
break;

so a recognized header name followed only by spaces/tabs running to
the exact end of the SIP payload, with no colon, makes the very next
statement read one byte past the buffer.

Make both "no more data" outcomes return NULL, matching the
convention sip_follow_continuation() already uses and that both
existing callers already check for.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`ea45f12a2766dae54e5426a23e8f4bafdbe2782e`	affected	< 9ae0a87e6f513293677fe286729fbae34d592215
`ea45f12a2766dae54e5426a23e8f4bafdbe2782e`	affected	< b6277622b7323000895b674321c9a1f060553188
`ea45f12a2766dae54e5426a23e8f4bafdbe2782e`	affected	< 0cfb96a118c5c6d46d7a1cfdfa18355ad734ca79
`ea45f12a2766dae54e5426a23e8f4bafdbe2782e`	affected	< c6beb08b1a9fdb96795816d8329ed75dd785d48e
`ea45f12a2766dae54e5426a23e8f4bafdbe2782e`	affected	< 60c012b2d05e1558b0f30ea3f15a2c3ca2f24d94
`ea45f12a2766dae54e5426a23e8f4bafdbe2782e`	affected	< 4be8380e3af008f418f97992c06f23be649a430d
`ea45f12a2766dae54e5426a23e8f4bafdbe2782e`	affected	< 4a30aa2ba007db18210dd52219ecbd5528c03523
`ea45f12a2766dae54e5426a23e8f4bafdbe2782e`	affected	< e8f8231824b5815f57ce62cba116e511b10196de

Linux

affected

Version	Status	Constraints
`2.6.26`	affected	—
`0`	unaffected	< 2.6.26
`5.10.271`	unaffected	≤ 5.10.*
`5.15.222`	unaffected	≤ 5.15.*
`6.1.189`	unaffected	≤ 6.1.*
`6.6.158`	unaffected	≤ 6.6.*
`6.12.111`	unaffected	≤ 6.12.*
`6.18.53`	unaffected	≤ 6.18.*
`7.2.7`	unaffected	≤ 7.2.*
`7.3`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[ea45f12a2766dae54e5426a23e8f4bafdbe2782e,60c012b2d05e1558b0f30ea3f15a2c3ca2f24d94)`	affected	code_commit	—
`[ea45f12a2766dae54e5426a23e8f4bafdbe2782e,4be8380e3af008f418f97992c06f23be649a430d)`	affected	code_commit	—
`[ea45f12a2766dae54e5426a23e8f4bafdbe2782e,4a30aa2ba007db18210dd52219ecbd5528c03523)`	affected	code_commit	—
`[ea45f12a2766dae54e5426a23e8f4bafdbe2782e,e8f8231824b5815f57ce62cba116e511b10196de)`	affected	code_commit	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`2.6.26`	affected	semver	—
`[0,2.6.26)`	unaffected	semver	—
`[6.12.111,6.13.0)`	unaffected	semver	—
`[6.18.53,6.19.0)`	unaffected	semver	—
`[7.2.7,7.3.0)`	unaffected	semver	—
`[7.3-rc3,*]`	unaffected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DLA	DLA-4841-1	linux security update
Debian DSA	DSA-6528-1	linux security update
Ubuntu USN	USN-8961-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9019-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9020-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9022-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9023-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9024-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9025-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9026-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9029-1	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-9039-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-9040-1	Linux kernel (Low Latency NVIDIA) vulnerabilities
Ubuntu USN	USN-9066-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-9091-1	Linux kernel (NVIDIA Tegra) vulnerabilities

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.216% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/0cfb96a118c5c6d46d7a1cfdfa18355ad734ca79
https://git.kernel.org/stable/c/4a30aa2ba007db18210dd52219ecbd5528c03523
https://git.kernel.org/stable/c/4be8380e3af008f418f97992c06f23be649a430d
https://git.kernel.org/stable/c/60c012b2d05e1558b0f30ea3f15a2c3ca2f24d94
https://git.kernel.org/stable/c/9ae0a87e6f513293677fe286729fbae34d592215
https://git.kernel.org/stable/c/b6277622b7323000895b674321c9a1f060553188
https://git.kernel.org/stable/c/c6beb08b1a9fdb96795816d8329ed75dd785d48e
https://git.kernel.org/stable/c/e8f8231824b5815f57ce62cba116e511b10196de

History

Oct 3, 2026 11:15 AM Added references View changes

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/0cfb96a118c5c6d46d7a1cfdfa18355ad734ca79 https://git.kernel.org/stable/c/9ae0a87e6f513293677fe286729fbae34d592215 https://git.kernel.org/stable/c/b6277622b7323000895b674321c9a1f060553188 https://git.kernel.org/stable/c/c6beb08b1a9fdb96795816d8329ed75dd785d48e

Sep 25, 2026 5:15 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-200 CWE-787

Sep 25, 2026 10:30 AM Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace() sip_skip_whitespace() returns dptr unchanged when its own loop exhausts the buffer (dptr == limit), instead of NULL like its sibling sip_follow_continuation() returns on its own "no more data" path. ct_sip_get_header() only checks for NULL after calling it: dptr = sip_skip_whitespace(dptr, limit); if (dptr == NULL) break; if (*dptr != ':' \|\| ++dptr >= limit) break; so a recognized header name followed only by spaces/tabs running to the exact end of the SIP payload, with no colon, makes the very next statement read one byte past the buffer. Make both "no more data" outcomes return NULL, matching the convention sip_follow_continuation() already uses and that both existing callers already check for.
Title		netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace()
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/4a30aa2ba007db18210dd52219ecbd5528c03523 https://git.kernel.org/stable/c/4be8380e3af008f418f97992c06f23be649a430d https://git.kernel.org/stable/c/60c012b2d05e1558b0f30ea3f15a2c3ca2f24d94 https://git.kernel.org/stable/c/e8f8231824b5815f57ce62cba116e511b10196de